deleted by Charles, Gordon♦, Gordon♦ 1 min ago
How is it that one person (whether a mod or not) can vote twice on the same post?
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Because first delete vote by Gordon was before becoming a moderator. And second vote was after becoming a moderator. There are several cases in other Stack Exchange sites for close votes too.
The explanation for this curious behavior is already explained by hims056; however, this duplication will not occur after the next build.